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Finding the Fourth Proportional to 630,355.20, 869,871 and 354,728.40

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Solution

The fourth proportional to 630,355.20, 869,871 and 354,728.40 is: 489,514.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    630,355.20 : 869,871 = 354,728.40 : x
  2. Step 2: Convert to fraction form
    630,355.20/869,871 = 354,728.40/x
  3. Step 3: Cross multiply
    630,355.20x = 869,871 × 354,728.40
  4. Step 4: Simplify right side
    630,355.20x = 308,567,948,036.40
  5. Step 5: Solve for x
    x = 308,567,948,036.40/630,355.20
  6. Step 6: Final answer
    x = 489,514.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.